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## Summary
The local sandbox provider hard-codes `/bin/bash` at three call sites in
`fabro-sandbox/src/local.rs` (`exec_command`, `exec_command_streaming`,
`spawn_stdio_process`). NixOS doesn't ship `/bin/bash` — only `/bin/sh`
and `/usr/bin/env` are managed under `/`, with bash living on `PATH` at
`/run/current-system/sw/bin/bash`. The result: a first run on NixOS dies
on the very first sandbox call (the git probe) with `No such file or
directory (os error 2)`, surfaced as `sandbox git unavailable`.
## Fix
Switch all three sites from `Command::new("/bin/bash")` to
`Command::new("bash")`. `PATH` is already preserved by
`filtered_env_vars` (and explicitly tested at `local.rs:1164`), so
libc's `execvp` lookup resolves bash on every distribution that has it
installed, including NixOS, without forcing users to symlink
`/bin/bash`.
The `/bin/bash` references in `docker.rs` are unaffected — those execute
inside containers where the path always exists.
## Credit
Diagnosis and proposed fix by @allouis in #232 — they ran the
PATH-lookup variant locally on NixOS 26.05 and confirmed workflows ran
cleanly without the symlink workaround.
Closes #232
---
[](https://github.com/EveryInc/compound-engineering-plugin)
🤖 Generated with Claude Opus 4.7 (1M context, extended thinking) via
[Claude Code](https://claude.com/claude-code)
Co-authored-by: Fabien O'Carroll <3218915+allouis@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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